Swift version: 5.0
There are two ways to center one
UIView inside another, depending on whether you use Auto Layout.
If you don’t use Auto Layout, it’s only one line of code:
childView.center = parentView.center
That sets the position once, so it won’t update when your user rotates their device or if they use something like Slide Over to change the size of your app.
If you’re using Auto Layout, you can center your child view inside its parent like this:
childView.centerXAnchor.constraint(equalTo: parentView.centerXAnchor).isActive = true childView.centerYAnchor.constraint(equalTo: parentView.centerYAnchor).isActive = true
Those constraints will automatically update as the available space changes.
UPGRADE YOUR SWIFT Hacking with Swift Live is a new iOS conference taking place in the UK this July, with all profits going to charity. Come and learn the major new APIs announced at WWDC19 with sessions and hands-on tutorials – click here to learn more!
Available from iOS 3.2
Did this solution work for you? Please pass it on!
Other people are reading…
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.